Variable frequency transformer

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A variable frequency transformer is used to transmit electricity between two asynchronous alternating current domains. The VFT is a relatively recent development (first deployed in 2004). Most grid interties use high-voltage direct current converters.

For instance, the Langlois Substation in Québec has installed a 100 MW variable frequency transformer to connect the asynchronous grids in Québec and the northeastern United States.

Smaller VFTs are used in large land-based wind turbines, so that the turbine rotation speed can vary while connected to a distribution grid.

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